6721622736212 has 12 divisors (see below), whose sum is σ = 11841785022900. Its totient is φ = 3338255586816.

The previous prime is 6721622736197. The next prime is 6721622736287. The reversal of 6721622736212 is 2126372261276.

It can be written as a sum of positive squares in 2 ways, for example, as 1283566638916 + 5438056097296 = 1132946^2 + 2331964^2 .

It is a super-2 number, since 2×6721622736212² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5638944653 + ... + 5638945844.

It is an arithmetic number, because the mean of its divisors is an integer number (986815418575).

Almost surely, 2^{6721622736212} is an apocalyptic number.

It is an amenable number.

6721622736212 is a deficient number, since it is larger than the sum of its proper divisors (5120162286688).

6721622736212 is a wasteful number, since it uses less digits than its factorization.

6721622736212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11277890650 (or 11277890648 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 47.

Adding to 6721622736212 its reverse (2126372261276), we get a palindrome (8847994997488).

The spelling of 6721622736212 in words is "six trillion, seven hundred twenty-one billion, six hundred twenty-two million, seven hundred thirty-six thousand, two hundred twelve".